The user has 1409 whitelist rules. I could do a binary search and get it in 11 passes, given that it's only one rule that's causing the problem. I can set that up in a test account and test at will, but I was hoping to avoid that. This is a reseller who recently switched over to us and this is the second issue we've had with mail loss due to BoxTrapper's inability to gracefully handle this kind of error.